We use freebsd jails and a lightweight in house orchestration tool written in Rust. We are running hundreds of Ryzen machines with 64 cores. Our costs compared to running equivalent on Amazon is so much less. We estimate our costs are about 6x lower than AWS and we have far better performance in terms of networking, CPU, and disk write speed.

Jails has been a pleasure to work with! We even dynamically scale up and down resources as needed.

We use bare metal machines on Interserver. But there a quite a few good data centers worth considering.